package com.example.administrator.ch02;

import android.content.Context;
import android.os.Bundle;
import android.app.Activity;
import android.widget.TextView;
import android.view.View;
import java.util.Calendar;
import java.util.Date;
import java.util.Locale;
import android.widget.Button;
import android.widget.DatePicker;
import android.view.View.OnClickListener;
import android.app.DatePickerDialog;
import android.widget.Toast;

public class ch02 extends Activity {

    private TextView showdate;
    private Button setdate;
    private int year;
    private int month;
    private int day;


    @Override
    public void onCreate(Bundle savedInstanceState)
    {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.main);

        showdate=(TextView) this.findViewById(R.id.showtime);
        setdate=(Button) this.findViewById(R.id.setdate);
        //初始化Calendar日历对象
        Calendar c=Calendar.getInstance(Locale.CHINA);
        Date mydate=new Date(); //获取当前日期Date对象
        c.setTime(mydate);////为Calendar对象设置时间为当前日期

        year=c.get(Calendar.YEAR); //获取Calendar对象中的年
        month=c.get(Calendar.MONTH);//获取Calendar对象中的月
        day=c.get(Calendar.DAY_OF_MONTH);//获取这个月的第几天
        showdate.setText("vn 当前日期:"+year+"-"+(month+1)+"-"+day); //显示当前的年月日

        //添加单击事件--设置日期
        setdate.setOnClickListener(new OnClickListener(){

            @Override
            public void onClick(View v)
            {

                //创建DatePickerDialog对象
                DatePickerDialog my_datePickerDialog=new DatePickerDialog(ch02.this,Datelistener,year,month,day);
                my_datePickerDialog.show();//显示DatePickerDialog组件
            }
        });

    }
    private DatePickerDialog.OnDateSetListener Datelistener=new DatePickerDialog.OnDateSetListener()
    {

        @Override
      //  Date date=new Date();
        public void onDateSet(DatePicker v, int y, int m,int d) {
            Date date=new Date(y-1900,m,d);
            Date current=new Date();
           if(date.getTime() <= current.getTime()) {
                //修改year、month、day的变量值，以便以后单击按钮时，DatePickerDialog上显示上一次修改后的值
                year = y;
                month = m;
                day = d;
                //更新日期
                updateDate();
            }
            else{
               Context context=getApplicationContext();
               CharSequence text ="无效的日期！";
               int duration = Toast.LENGTH_SHORT;
               Toast toast=Toast.makeText(context,text,duration);
               toast.show();
           }
        }
        //当DatePickerDialog关闭时，更新日期显示
        private void updateDate()
        {
            //在TextView上显示日期
            showdate.setText("当前日期："+year+"-"+(month+1)+"-"+day);
        }
    };


}